fromPredicate<A> function

Option<A> fromPredicate<A>(
  1. Predicate<A> predicate,
  2. A value
)

Returns an Option based on the evaluation of a Predicate on a value.

This function takes in a predicate (a function that returns a boolean) and a value of type A. It applies the predicate to the value.

If the predicate is true for the given value, this function will return Some containing the value. If the predicate is false, it will return None.

Example usage:

final isEven = (int value) => value % 2 == 0;
final evenOption = fromPredicate(isEven, 4);  // This will be Some(4)
final oddOption = fromPredicate(isEven, 5);  // This will be None

fromPredicate can be useful for performing validation checks and error handling. If the predicate function represents a validation check, fromPredicate can be used to create an Option that is Some if the validation check passes and None if it fails.

Implementation

Option<A> fromPredicate<A>(Predicate<A> predicate, A value) {
  return predicate(value) ? Some(value) : None();
}